update CHANGELOG

Author: jgzuke

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - `apollo`
   - Add `ApolloConfig` type to exports from `apollo` [#1413](https://github.com/apollographql/apollo-tooling/pull/1413)
+  - Add `--compactOutput` flag to `service:check` [#1404](https://github.com/apollographql/apollo-tooling/pull/1404)
 - `apollo-codegen-core`
   - <First `apollo-codegen-core` related entry goes here>
 - `apollo-codegen-flow`